[pianotech] Modified L Scale with 5 note transition

[Greg Newell]

While the formula is of some import it seems that equal weight could be
placed on seeing (and ultimately hearing) the differences derived from the
change

Greg Newell
Greg's Piano Forté
www.gregspianoforte.com
216-226-3791 (office)
216-470-8634 (mobile)


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Love
Sent: Thursday, May 28, 2009 12:29 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Modified L Scale with 5 note transition

I think I took my Z formula from Roberts.  It's all calculated from the
string data, not from the board.  There are a couple of formulas for this
particular factor and nobody seems 100% satisfied with how the data output
relates to the actual sound produced.  Others may be able to contribute more
to the formulaic issues.  I input the data so long ago now that I've
conveniently forgotten the headache I got trying to translate the formula
into spread sheet language.  

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Gene Nelson
Sent: Thursday, May 28, 2009 9:14 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Modified L Scale with 5 note transition

I have read how Del Fandrich describes Z = the square root of springiness 
multiply by inertia.
Inertia should be a simple Newtonian mass measure - do you weigh the board?
How do measure springiness - it could only come from the ribs - am I on the 
right track?
How do you get this onto spreadsheet?
Gene
----- Original Message ----- 
From: "Ron Nossaman" <rnossaman at cox.net>
To: <pianotech at ptg.org>
Sent: Thursday, May 28, 2009 8:57 AM
Subject: Re: [pianotech] Modified L Scale with 5 note transition


David Love wrote:
> Speaking of modifying scales.  Don't know how much of this will come
> through but here's an example of a modified L scale with a  5 note
> transition bridge that I'm playing with.  You can see the shape of the
> bridge by the purple line showing the speaking lengths, the five note
> transition is seen where the drop in inharmonicity is.  The goal is
> balancing tension (red), impedance (grey) and inharmonicity.  The blue
> line at the bottom indicates break point %.

Here's what my last one looked like.
Ron N